Model building implement



FIG. 1 is a front elevational view of a model building implement showing my new design, the rear, right and left side elevational views being identical;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a perspective view thereof. 

The ornamental design for a model building implement, as shown and described. 